code: def test_get_scores(self):
      result = (
          BM25Difference(self.corpus)
          .set_categories("hamlet")
          .get_scores()
      )
      self.assertEquals(type(result), pd.Series)
      np.testing.assert_array_equal(
          np.array(result.index), self.corpus.get_terms()
      )
  
file_path: scattertext/scattertext/test/test_BM25Difference.py
imports: from unittest import TestCase
  import pandas
  import numpy
  from scattertext.termscoring.BM25Difference import BM25Difference
  from scattertext.test.test_termDocMatrixFactory import build_hamlet_jz_corpus
label_desc: Use image node_id 2 for calling the TestBM25Difference obj's underlying member method code with example usage: obj.test_get_scores() without return types